Fiche publication
Date publication
janvier 2014
Auteurs
Membres identifiés du Cancéropôle Est :
Dr SANDOZ Patrick
Tous les auteurs :
Guelpa V, Laurent GJ, Sandoz P, Zea JG, Clevy C
Lien Pubmed
Résumé
This paper presents a visual measurement method able to sense 1D rigid body displacements with very high resolutions, large ranges and high processing rates. Sub-pixelic resolution is obtained thanks to a structured pattern placed on the target. The pattern is made of twin periodic grids with slightly different periods. The periodic frames are suited for Fourier-like phase calculations-leading to high resolution-while the period difference allows the removal of phase ambiguity and thus a high range-to-resolution ratio. The paper presents the measurement principle as well as the processing algorithms (source files are provided as supplementary materials). The theoretical and experimental performances are also discussed. The processing time is around 3 micros for a line of 780 pixels, which means that the measurement rate is mostly limited by the image acquisition frame rate. A 3-sigma repeatability of 5 nm is experimentally demonstrated which has to be compared with the 168 microm measurement range.
Référence
Sensors (Basel). 2014 Mar 12;14(3):5056-73
